Temperature evolution in magnesium alloy during static and cyclic loading

Abstract

The temperature evolution in an AZ31B magnesium alloy plate was measured during static and cyclic loading via infrared thermography. The relationship between loading process and temperature evolution was established. The yield limits during static and cyclic loading were predicted. The temperature variation on the specimen surface was closely related with the applied load. The initial decrease in temperature during tension was caused by the thermoelastic effect, and the minimum temperature corresponded to the yield limit. During cyclic loading, the thermoelastic effect, viscous effect and plastic work had an effect on the temperature evolution. The cyclic yield limit was <1/6 of the yield limit obtained in the tension test.

Fatigue Performance Evaluation of AZ31B Magnesium Alloy Based on Statistical Analysis of Self-Heating

“…Then, the temperature rise started to drop rapidly from about 30 s. Finally, at about 400 s, the temperature evolution began to enter a relatively stable stage. This stable stage will continue until macro fatigue cracks are initiated [ 32 ]. The macroscopic fatigue crack will grow rapidly after initiation.…”

Rapid evaluation of fatigue limit in AZ31B magnesium alloy using acoustic emission

“…The rate of energy release increases when the load exceeds the fatigue limit, because of the change caused by damage [9,33]. Viscoelasticity deformation was the main form of deformation when the load was lower than the fatigue limit.…”

“…This method is time-consuming, as it requires testing a large number of specimens at different load levels. Infrared thermography-based methodologies were later employed to overcome this fundamental limitation and to facilitate the rapid determination of fatigue limit [9,10]. Risitano et al developed a thermographic method (TM) to establish the fatigue limit [11].…”

Cyclic hardening/softening behaviour in AZ31B magnesium alloy based on infrared thermography

“…Stage III is the stable phase, and the nonelastic effect and heat conduction can reach the dynamic equilibrium. 26 In stage IV, microcrack initiates and expands speedy with the cyclic cycles, meanwhile, the crack tip produces a localised plastic deformation, leading to a rapid temperature rise until the specimen fracture. In the last stage, the sample is gradually cooled to room temperature.…”